awesome thanks got it plugged back in and took the car for a run, its running really lean on boost now, around 13afr could it be because the timing would have been retarded with the sensor unplugged, and now that its back in the timing is back to normal/advanced? ive unplugged the battery to reset the ecu, to see if that fixes it Edit: took the car a run after resetting the ecu, afrs are much better now 11-12, car also seems alot smoother and pulls better off boost Could this be a result of the more advance timing, or is it in my head?